Qt arduino serial_port

Qt arduino serial_port

• 1.
  Arduino Qt HMI- Serial Port A Term Paper Final Report by SATYENDRA KUMAR J M. Tech. (Mechatronics) 1st semester Student Under the supervision of T ESHWAR RAO ASSOCIATE PROFESSOR DEPARTMENT OF MECHANICAL ENGINEERING K L University, Green Fields, Vaddeswaram- 522502, Guntur(Dist), Andhra Pradesh, India. April - 2017
• 2.
  contents • Abstract • Introduction •Required Setup • Methodology • Theory(PWM) • analogWrite() • Observation • analogRead() • Qt HMI Screens. • References
• 3.
  Abstract • To createcustomized Qt graphical user interfaces (GUI), which facilitates brightness control of LED, and RPM display of DC Motor,connected to an Arduino Uno Microcontroller.
• 4.
  Introduction • By usingthe Qt's serial port functionality in conjunction with an Arduino uno Microcontroller (RS232 device) ,it is possible to control the color brightness of an LED. • similarly change the speed of a DC motor by sending the values from a Qt GUI in a range of 0 to 255 and display the RPM of motor on the same GUI.
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  • Serial commandscan be sent from GUI (Qt) and the same way parsing them on Arduino (at a baud rate of 9600),communication will be established with the Qt GUI and there to the LED or DC Motor connected to Arduino Microcontroller by jumper wires on a breadboard.
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  Required Setup • InstallQt 5.7.1. • Serial Port Library installed on the Host machine. (Windows/Ubuntu). • Qt C++ based GUI screen for sending PWM values (0 to 255). • Resistors(300 Ω upto 1KΩ), (red, purple, brown stripes) • LEDs (Red, Green, Blue colors). • DC Motor.(0to 5Volts),1000RPM.
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  • Jumper wirepack (M to M) • BreadBoard
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  Methodology • It ispossible to control the brightness intensity of the Red, Green, Blue lights (RGB LED)on the Breadboard by writing code in Qt C++, and sending commands from Qt GUI to the Arduino microcontroller. • So whenever there is a change in the value on the GUI control present on the computer, the corresponding value is sent to Arduino microcontroller.
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  Pulse Width Modulation •Pulse Width Modulation( PWM), is a technique for getting analog results with digital means, the on-off pattern can simulate voltages in between full on (5 Volts) and off (0 Volts) by changing the portion of the time the signal spends on to off. • The duration of "on time" is called the pulse width.
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  • There are5 pins on most Arduino boards marked with "~" next to the pin number (on some boards it is an “PWM” symbol). • Pulse Width Modulation (or PWM) is a technique for controlling power.In this case it is used to control the brightness of LEDs.
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  • Roughly every1/500 of a second, the PWM output will produce a pulse. The length of this pulse is controlled by the 'analogWrite' function. • By specifying a value in the analogWrite(val), function between 0 and 255 a pulse can be produced.
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  • If theoutput pulse is only high for 5% of the time then whatever is driven will only receive 5% of full power. • Similarly if the output pulse is high for 95% of the time then whatever is driven will receive 95% of full power. (in this case an LED and DC Motor).
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  • SIGNALS fromone of the PWM pins on Arduino Uno Microcontroller at different voltages and duty cycles. • Voltages (0V to 5V) • Duty cycles samples (5%),(50%),and(90%).
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  • To getvarying analog values, change, or modulate, the pulse width. • If this on-off pattern is repeated fast enough on Arduino,with an LED,the result is as if the signal is a steady voltage between 0 and 5v controlling the brightness of the LED.
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  analogWrite • 'analogWrite(0)' willnot produce any pulse. • 'analogWrite(255)' will produce a pulse that lasts all the way until the next pulse is due. • Values between 0 and 255 a pulse can be produced with varying width.
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  analogRead • The Arduinoboard will map input voltages between 0 and 5 volts into integer values between 0 and 1023. • 'analogRead()' takes pin number starting from 0 to 5,0to 15 on Arduino Mega. • 'analogRead(1)' returns value ranging from 0 to1023.
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  • By changingthe values from 0 to 255 from Qt GUI motor speed will vary,0 being 0 RPM and 255 at the max rpm of the DC motor.
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  Qt HMI screens
• 22.
  References • Modeling andSimulation of Pulse-Width Modulation Inverter • GAI Zhi-wu 1,LI Dong-sheng 1 ,SONG Zhe-cun 1 ,MA Yong 2,YU Ji-lai 2 (1.Electromechanical Engineering College of Northeast Forestry University,Harbin Heilongjiang 150040,China; 2.HarBin Institute of Technology,Harbin Heilongjiang 150001,Chi • Simulation Research of Switching Power Supply Based on PWM • WANG Bing,ZHANG Runhe,SUN Yanxia (Information Engineering College,Inner Mongolia University of Technology,Hohhot,010051,China)
• 23.
  • https://forum.arduino.cc • https://forum.qt.io